/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0,
		anchorY: 0.6,
		scaleX: 4,
		scaleY: 4
	});
	self.speed = 5;
	self.update = function () {
		self.x += self.speed;
		if (self.x < 0) {
			self.destroy();
		}
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -3;
	self.update = function () {
		self.x += self.speed;
		if (self.x < 0 || self.x > 2048) {
			self.destroy();
		}
	};
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		// Scale horizontally by 1.2
		scaleY: 3 // Scale vertically by 1.2
	});
	self.update = function () {
		// Ground moves from right to left
		self.x -= 5;
		if (self.x + self.width < 0) {
			self.x = 2048;
		}
	};
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		// Scale horizontally by 1.2
		scaleY: 3 // Scale vertically by 1.2
	});
	self.speed = 5;
	self.update = function () {
		if (self.x < 0) {
			self.x = 0;
		}
		if (self.x > 300) {
			self.x = 300;
		}
		// Player only moves horizontally
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game();

/**** 
* Game Code
****/ 
var background1 = game.addChild(LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1366,
	width: 2048,
	height: 2732
}));
var background2 = game.addChild(LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 3072,
	y: 1366,
	width: 2048,
	height: 2732
}));
var ground = game.addChild(new Ground());
ground.x = 1024;
ground.y = 2732 - 200; // Move the ground asset a little bit up from the bottom of the screen
var player = game.addChild(new Player());
player.x = 1024;
player.y = ground.y - player.height;
var enemies = [];
var bullets = [];
game.update = function () {
	background1.x -= 5;
	background2.x -= 5;
	if (background1.x <= -1024) {
		background1.x = background2.x + 2048;
	}
	if (background2.x <= -1024) {
		background2.x = background1.x + 2048;
	}
	if (LK.ticks % 60 == 0) {
		var enemy = game.addChild(new Enemy());
		enemy.x = 2048;
		enemy.y = Math.random() * 2732;
		enemies.push(enemy);
	}
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.x < player.x) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			if (bullet.intersects(enemy)) {
				bullet.destroy();
				bullets.splice(i, 1);
				enemy.destroy();
				enemies.splice(j, 1);
				break;
			}
		}
	}
	// Check if player collides with the ground asset
	if (player.intersects(ground) && player.y > ground.y) {
		// Show game over. The game will be automatically paused while game over is showing.
		LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
	}
};
game.down = function (x, y, obj) {
	var bullet = game.addChild(new Bullet());
	bullet.x = player.x;
	bullet.y = player.y;
	bullets.push(bullet);
	// Add flash screen effect when bullet is fired
	LK.effects.flashScreen(0xff0000, 1000);
};
game.move = function (x, y, obj) {
	player.y = y;
};

===================================================================
--- original.js
+++ change.js
@@ -144,13 +144,10 @@
 	var bullet = game.addChild(new Bullet());
 	bullet.x = player.x;
 	bullet.y = player.y;
 	bullets.push(bullet);
-	// Add explosion vfx when bullet is fired
-	LK.effects.explosion(bullet.x, bullet.y, {
-		scale: 0.5,
-		speed: 0.5
-	});
+	// Add flash screen effect when bullet is fired
+	LK.effects.flashScreen(0xff0000, 1000);
 };
 game.move = function (x, y, obj) {
 	player.y = y;
 };
\ No newline at end of file